The thing with RUGx is that people are super high on Growth Spiral and will probably force it a bit too much. I've done it myself the last couple of weeks and the deck felts cool enough. Not amazing but I wouldn't be surprised to face it at a GP. At least I find it way more likely to happen than to face 8whack, Eldrazi or Pyromancer for that matter.
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Currently Playing: WUMiracles ControlUW RUBGrixis Death's ShadowBUR
I think you're missing Titanshift and probably RUGx Scapeshift. I don't think there's much incentive to test both versions of Burn. The matchups won't play out all that different and neither will the sideboard plans. I know it has fallen out of favor but Hollow One is kinda still a thing. You could also add a Creature Toolbox deck, Abzan CoCo comes to mind.
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Currently Playing: WUMiracles ControlUW RUBGrixis Death's ShadowBUR
WUMiracles ControlUW
RUBGrixis Death's ShadowBUR
WUMiracles ControlUW
RUBGrixis Death's ShadowBUR